import java.util.Objects;

/**
 * @author : zzr
 * @description :
 * @date :
 */
class Person{
    String id;

    public Person(String id) {
        this.id = id;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Person person = (Person) o;
        return Objects.equals(id, person.id);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(id);
    }
}

public class HashBuck2<K,V> {
    static class Node<K, V> {

        public K key;
        public V val;

        public Node next;
        public Node(K key, V val) {
            this.key = key;
            this.val = val;
        }
    }
    public Node<K,V>[] array;
    public int usedSize;

    public HashBuck2() {
        array = (Node<K, V>[]) new Node[10];
    }

    public void put(K key, V val) {
        int hash = key.hashCode();
        int index = hash % array.length;

        Node cur = array[index];

        while(cur != null) {
            if(key.equals(cur.key)) { //只能用equals方法而不是==
                cur.val = val;
                return;
            }
            cur = cur.next;
        }

        Node node = new Node<>(key, val);
        node.next = array[index];
        array[index] = node;
        usedSize++;
    }
    public V get(K key) {
        int hash = key.hashCode();
        int index = hash % array.length;
        Node<K,V> cur = array[index];
        while(cur != null) {
            if(key.equals(cur.key)) {
                return cur.val;
            }
            cur = cur.next;
        }
        return null;
    }

}
